<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Configuration Reference (7.0.52) - The Cluster Valve object</title><meta name="author" content="Filip Hanik"><style type="text/css" media="print">
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<ul><li><a href="#Introduction">Introduction</a></li><li><a href="#org.apache.catalina.ha.tcp.ReplicationValve">org.apache.catalina.ha.tcp.ReplicationValve</a><ol><li><a href="#org.apache.catalina.ha.tcp.ReplicationValve/Attributes">Attributes</a></li></ol></li><li><a href="#org.apache.catalina.ha.session.JvmRouteBinderValve">org.apache.catalina.ha.session.JvmRouteBinderValve</a><ol><li><a href="#org.apache.catalina.ha.session.JvmRouteBinderValve/Attributes">Attributes</a></li></ol></li></ul>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>
  <p>
  A cluster valve is no different from any other <a href="valve.html">Tomcat <code>Valve</code></a>.
  The cluster valves are interceptors in the invocation chain for HTTP requests, and the clustering implementation
  uses these valves to make intelligent decision around data and when data should be replicated.
  </p>
  <p>
  A cluster valve must implement the <code>org.apache.catalina.ha.ClusterValve</code> interface.
  This is a simple interface that extends the <code>org.apache.catalina.Valve</code> interface.
  </p>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.tcp.ReplicationValve"><strong>org.apache.catalina.ha.tcp.ReplicationValve</strong></a></font></td></tr><tr><td><blockquote>
  The <code>ReplicationValve</code> will notify the cluster at the end of a HTTP request
  so that the cluster can make a decision whether there is data to be replicated or not.
  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.tcp.ReplicationValve/Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>
    <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
        Set value to <code>org.apache.catalina.ha.tcp.ReplicationValve</code>
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">filter</code></td><td align="left" valign="center">
        For known file extensions or urls, you can use this Valve to notify the
        cluster that the session has not been modified during this  request and
        the cluster doesn't have to probe the session managers for changes. If
        the request matches this filter pattern, the cluster assumes there has
        been no session change. An example filter would look like <code>
        filter=".*\.gif|.*\.js|.*\.jpeg|.*\.jpg|.*\.png|.*\.htm|.*\.html|.*\.css|.*\.txt"
        </code>. The filter is a regular expression using
        <code>java.util.regex</code>.
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">primaryIndicator</code></td><td align="left" valign="center">
        Boolean value, so to true, and the replication valve will insert a request attribute with the name
        defined by the <code>primaryIndicatorName</code> attribute.
        The value inserted into the request attribute is either <code>Boolean.TRUE</code> or
        <code>Boolean.FALSE</code>
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">primaryIndicatorName</code></td><td align="left" valign="center">
        Default value is <code>org.apache.catalina.ha.tcp.isPrimarySession</code>
        The value defined here is the name of the request attribute that contains the boolean value
        if the session is primary on this server or not.
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">statistics</code></td><td align="left" valign="center">
        Boolean value. Set to <code>true</code> if you want the valve to collect request statistics.
        Default value is <code>false</code>
      </td></tr></table>
  </blockquote></td></tr></table>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.session.JvmRouteBinderValve"><strong>org.apache.catalina.ha.session.JvmRouteBinderValve</strong></a></font></td></tr><tr><td><blockquote>
  In case of a mod_jk failover, the <code>JvmRouteBinderValve</code> will replace the
  <code>jvmWorker</code> attribute in the session Id, to make future requests stick to this
  node. If you want failback capability, don't enable this valve, but if you want your failover to stick,
  and for mod_jk not to have to keep probing the node that went down, you use this valve.
  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.session.JvmRouteBinderValve/Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>
    <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
        <code>org.apache.catalina.ha.session.JvmRouteBinderValve</code>
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">enabled</code></td><td align="left" valign="center">
        Default value is <code>true</code>
        Runtime attribute to turn on and off turn over of the session's jvmRoute value.
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">sessionIdAttribute</code></td><td align="left" valign="center">
        Old sessionid before failover is registered in request attributes with  this attribute.
        Default attribute name is <code>org.apache.catalina.ha.session.JvmRouteOrignalSessionID</code>.
      </td></tr></table>
  </blockquote></td></tr></table>
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